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Plants ofMolinia caeruleawere supplied with either a low (0.2 mol m-3) or high (10 mol m-3) supply of nitrogen over two growing seasons. A total of 14 destructive plant harvests were made: when plants were in an over-wintering state prior to the second season; immediately following bud burst; and on 12 further occasions throughout the second season. The relationships between shoot nitrogen concentration...
Plants ofLolium perenneandFestuca rubrawere grown in sand culture receiving all nutrients as a complete nutrient solution containing 1.5 mMNH 4 NO 3 , and subjected to one of three defoliation treatments: undefoliated, defoliated on one occasion, or defoliated weekly. 15 N labelling was used to determine the rate of N uptake, allowing the amount of N remobilized from storage...
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